ZHUCO SZW26-160/D404.4 1-0-2 Three-position four-section high-current changeover switch

The SZW26-160/D404.4 is a three-position (-ON-0-+ON), four-section (four-layer) rotary changeover switch with a rated current of up to 160A. Its core design allows for the simultaneous control of four independent high-current double-throw circuits through a single operation, enabling the overall switching between two operating states, and providing complete and safe electrical isolation in the intermediate "0" position.
Key Parameters and Functions
Electrical Specifications:
Rated Operating Voltage: AC 440V (50/60Hz)
Rated Insulation Voltage: 660V
Rated Current: 160A
Contact Configuration and Logic:  ​​Uses a four-layer structure, with each layer controlling an independent double-throw circuit.
Position "-ON": Connects the first set of four outputs (contacts 1-2, 5-6, 9-10, 13-14).
Position "0" (Middle Position): All contacts are completely disconnected, providing a safe isolation point.
Position "+ON": Connects the second set of four outputs (contacts 3-4, 7-8, 11-12, 15-16).
Structure and Materials:
Contacts: Special high-capacity silver alloy, ensuring ultra-low contact resistance, excellent arc resistance, and anti-welding performance at 160A current.
Conductors: Heavy-duty thickened copper components to meet the long-term current carrying capacity and heat dissipation requirements for ultra-high currents.
Housing and Operation: Made of high-strength, flame-retardant, high-temperature resistant, environmentally friendly engineering plastic with a robust mechanical structure. Panel markings support customization, and the operating positions are clear and reliable.
Environmental Conditions:
Operating Temperature: -25°C to +40°C (average temperature over 24 hours ≤ +35°C)
Altitude: ≤ 2000 meters
Relative Humidity: ≤ 50% at +40°C; up to 90% at +20°C (protection against possible condensation is required). Lifespan Specifications:
Mechanical life: ≥ 300,000 cycles
Electrical life: ≥ 60,000 cycles (at a rated load of 160A, operating frequency ≤ 120 cycles/hour)
Application Scenarios:
This switch is designed for complex and critical industrial systems that require the simultaneous switching of multiple high-current (160A level) loads, power supplies, or control circuits.
Core Application: Used for the overall manual switching between "primary/backup" or "operating/maintenance" modes of two complete ultra-high-power equipment systems (such as those containing three-phase main motors and large auxiliary equipment).
Centralized Control of Complex Systems: In heavy metallurgical equipment, large mining machinery, ship power systems, and critical power distribution devices, it allows for integrated mode selection by simultaneously switching the status of the main power circuit, control power circuit, cooling system circuit, and signal indication circuit with a single operation.
High-Reliability Manual Operation Node: Suitable for applications requiring extremely high operational reliability, serving as a manual bypass switch or system isolation switching point, providing a reliable backup manual operation solution for automated systems.